Byttany Haines and her boyfriend Daniel Aguilar said they saw the deadly incident up close.

"He didn't move; he wasn't screaming; he didn't try to resist; he was handcuffed," Aguilar said.

The Riverside County Sheriff’s office told NBC4 that a deputy chased down and arrested Haslip while responding to a "man with a gun" call. When backup arrived, the office said Haslip "rolled over" and revealed a gun.

Haines said that’s when deputies started screaming for the teen to “get down.”

"And you hear one shot and he doesn't move after that, you know he’s dead," Haines said. "I started screaming, I cried and I just kept yelling, 'Call the news, you guys can’t just do that to people.'"

"I felt like crying you know because I never seen anyone get popped like that," Aguilar said.

Anita Morris, Haslip’s aunt, said the man’s father is in prison and his mother lives out of state. Morris said she always believed Haslip would turn his life around and is devastated he won’t get that chance.